1. HW & Systems: Networks IS 101Y/CMSC 101 Computational Thinking and Design Thursday, October 24, 2013 Carolyn Seaman University of Maryland, Baltimore County

2. Introduction Computer networks have had a revolutionary impact on society and technology Electronic commerce Worldwide communications Spread of information and data We take for granted: access to information on any subject immediate contact with people around the world streaming audio and video wired or wireless access from every device

3. Communication Protocols Protocol: a standard set of rules for communicating Standards evolve over time International agreements make Internet possible Internet Society makes standards and promotes research: www.isoc.orgwww.isoc.org

4. Network Layers (more abstraction!) Link layer Hardware, routers Network/Internet layer Layer of abstraction above routers/hardware Deliver an individual message – no guarantees IP (Internet Protocol) – IP addresses, message format Transport layer Layer of abstraction above messages Ensures reliability – retransmission, host-to-host communication TCP (Transmission Control Protocol) Application layer Layer of abstraction provides seamless view of inter-application communication Many protocols: HTTP [www], VoIP [voice], POP [mail],...

5. Routing Routing algorithms are used to move packets efficiently and balance load across the network Routing of packets is determined dynamically (and locally) A-B-C-D or A-B-F-D or A-E-F-D or A-E-F-B-C-D Challenges: Redundant paths, fault tolerance, responsiveness to traffic load Picture from J. Glenn Brookshear, “Computer Science: An Overview”

6. HTTP Hypertext Transfer Protocol (HTTP) Web page/service identified by unique URL (Uniform Resource Locator) protocol://host name/page Multiple protocols: http, mailto, news, ftp Web browser uses TCP to send formatted messages to Web server, and vice versa TCP in turn uses IP, which in turn uses link layer protocols

7. HTTP (cont.) Process: http://hostname/page Browser reads protocol, extracts host name (and requests IP address from DNS server) Sends a connect message to port 80 on that machine After connection established, sends “Get” message with page information Server responds with message containing page contents, size, and indicates connection closes at end of message

8. Courses in Systems Topics

9. BTA Required 350: Business Communication Systems Electives 310: Software and Hardware Concepts 430: Information Systems and Security 432: Computer Viruses

10. Information Systems Required 310: Software and Hardware Concepts 450: Data Communications and Networks 451: Network Design and Management Electives 430: Information Systems and Security 432: Computer Viruses 451M,U,W: Specialized networking courses 452: Internetworking Certificates Network Administration (NETC)

11. Computer Science Required 313: Computer Organization and Assembly Language Programming 411: Computer Architecture 421: Operating Systems Electives 426: Principles of Computer Security 481: Computer Networks 483: Parallel and Distributed Processing 487: Introduction to Network Security

12. Computer Engineering Required 212: Principles of Digital Design 306: Introduction to Circuit Theory 310: Systems Design and Programming 311: C Programming and Embedded Systems 314: Principles of Electronic Circuits 411: Computer Architecture 421: Operating Systems Electives 315: Principles of VLSI Design 415: Programmable Logic Devices 423: Principles of Communication Engineering 447: Analog Integrated Circuit Design LOTS of others! Tracks Systems Architecture Communications

13. Careers in Hardware and Systems

14. System on a Chip Design Create full computing systems on one chip for mobile devices Apple, Nvidia, Qualcomm, Intel, Samsung CMPE

15. Signal Processing Analyze signals to translate data to something people can use SAIC, Northrop Grumman, Lockheed Martin, Google CMPE, CMSC

16. Hardware Design Engineer Design boards so that all necessary components fit inside physical hardware constraints like size Apple, Samsung, HTC, Nokia CMPE

17. Operating System Development Develop the operating system for devices to perform tasks for users Apple, Microsoft, device manufacturers CMSC, CMPE

18. Information Protection Create secure ways to transfer information both wirelessly and locally Secure data once it is on the device Verizon, AT&T, NSA, government contractors IS, CMSC, CMPE

19. Computer Architecture Research new ways to create chips Research new technologies and develop new algorithms Intel, Samsung, AMD, Nvidia, Apple CMPE, CMSC

20. Systems Testing Test systems of preexisting hardware to make sure all components are working together properly Basically anywhere that hires computer engineers CMPE

21. Network Administrator Maintain computer hardware and software for a company Deploy new technology and ensure a smooth transition All companies that use technology need a network administrator IS, BTA, CMSC

22. Systems Analysis Teach employees how to use new technology to improve their workflow Most companies utilize systems analysts IS, BTA

23. Giving Effective Presentations

24. Rule Know what on earth you’re doing up there! Rule #2: Know what you want to say Rule #3: Know your audience Rule #4: Know how long you have

25. Rule #2: Know What You Want to Say Just reciting a series of statistics or showing a bunch of numbers is not interesting to most people You should give enough detail to get your interesting ideas and observations across, but not enough to lose your audience They want to hear what you learned that was interesting and why they should care Whatever you do, don’t just read your slides!

26. Rule #3: Know Your Audience You’re talking to the other students (not me) You need to be sure you’re explaining each new idea clearly The most important thing is to emphasize what you’ve discovered and why they should care!

27. Rule #4: Know How Long You Have How long is the talk? Are questions included? A good heuristic is 1-2 minutes per slide...but it depends a lot on the content of those slides! If you have too many slides, you’ll skip some or—worse—rush desperately to finish. Avoid this temptation!! Almost by definition, you never have time to say everything about your topic, so don’t worry about skipping some things! Unless you’re very experienced giving talks, you should practice your timing

28. Data Presentations Presenting: You should plan to use your own laptop. Be sure you know how to use your laptop with a projector! Test your setup before class (or after class on an earlier day) Content: You should provide a well organized presentation that clearly answers the four questions and subquestions (don’t forget the one specifically for the presentation) in the assignment Timing: Each group should aim for a 7-minute presentation This works out to (roughly) 5 to 10 slides (but you could have more, depending on how much material there is on each slide) I will cut you off if you go too long! There will be a few minutes after each presentation for questions

29. Data Presentations Other requirements: Include charts from your Excel file that you need to answer the questions But add explanatory text! At least one PowerPoint animation At least one graphic not from your Excel file Team involvement: EVERY team member must present at least one slide Individual team members will be asked questions EACH team member must understand all parts of the analysis that was done, even if they didn’t do it themselves.

30. Presentation Grading Review the assigned readings on the online schedule for Oct. 18 Very good tips We based our grading criteria on the previous slides plus those readings Your grade will be based on: The quality of your slides Content Appearance Organization Your professionalism (group and individual) The clarity of your presentation (individual) The timing of your presentation (group) How well you answer questions (individual)

31. Next Class Next Tuesday is an in-class lab You’ll have time to work with your team on the semester game project You’ll have access to me and the TFs to help you You’ll get feedback on your design by the weekend Meet with your team before Tuesday and start working on pieces of your project Come to class on Tuesday with some SPECIFIC part of the project you want to work on, either individually or together